Cutlery-grinding machine



W. TYZACK, A. WRIGHT AND H. SENIOR.

CUTLERY GRINDING MACHINE.

APPLICATION FILED AuG.14. 1 919.

- Patented Oct 19,1920.

3 SHEETS-SHEET 1 W. TYZACK, A. WRIGHT AND H. SENIOR.

Patehted 0cf.19,1920.

3 SHEETSSHEET 2.

W. TYZACK, A. WRIGHT AND-H. SENIOR.

CUTLERY GRINDING MACHINE.

- APPLICATION FILED AUG. 14, I 9 I 9.

L355,87O Patented Oct/19,1920. v v 3 SHEET SSHEET 3.

UNITED STATES PATENT-OFFICE.

. WALTER TYZAGK, ALBERT WRIGHT, AND HERBERTISENIOR, 0F SHEFFIELD, ENGLAND.

CUTLERY-GRINDIN G MACHINE.

Specification of Letters latent. Pate t d ()t 19 1920 Application filed August 14, 1919. Serial No. 317,447.

and to this end the invention consists in providing such a machine with a specially constructed work holder by means of which a blade may be rigidly held during the grinding thereof.

Our invention will be better understood on reference to-the accompanying drawings in which a Figure 1 is a perspective view of a double ended machine made according to our invention. v

Fig. 2 is a plan View of the work holding slide.

Fig. 3 shows a plan and side elevation of bolts and pin fixture, forming part of the work slide.

Fig. 4 shows a similar pair of views of the bolt with the pin fixture removed.

Fig. 5 shows a side elevation and plan of the pin fixture.

Fig. 6 shows three views of the pin carrier separated from the pin fixture.

Fig. 7 is an outline plan of the work slide showing the relative positions of a blade when in position for all three grinding operations. p

The same letters refer to similar parts throu h ut the several views.

Referring to Fig. 1 it will be seen-that a pair of grinding wheels at, a with driving spindle b and fast and loose pulleys c 0 are mounted in bearings (l d on pedestals e e. In convenient proximity to each rinding wheel a is placed a screw actuated sliding headstock f carrying a transversely sliding work holder 7 which can also be turned about a pivot point on the headstock to place it at any desired angle to the grinding wheel.

In connection with the work holder 9 there are provided pins k h k the purpose of which, as shown in Fig. 7 is to engage with the hole in the tang of the blade. On

the upper face of the work holder there are also three adjustable arms 2', j and 70 carrying stops 71 j and k respectively, which stops serve as abutments for the 'bladesto be ground and also insure the said blades being correctly placed in relation tothe grinding wheel. V

The workholder 9 may be moved to and fro on the headstock f by lever and link motion, or by rack and pinion mechanism, the latter form of actuating means being partially indicated in Fig. 1, the operating the said shank being secured by a set screw m The pin fixture n, as shown in Fig. 5 is formed with a tapering hole n and a side re'ess n Into the hole a is fitted a tapering pin carrier 0 with lug o to engage the recess n and thus prevent rotation of the carrier. A hole in the carrier receives a pin (such as h) and a saw cut 0 insures the pin being tightly gripped when the carrier 0 is pulled firmly down into the hole 11. by the set screw 0 V The pinfixtures n lie in slots in a plate 79 on the work holder 9 and are adjustable therein by means of'the nuts m m on the bolts m abuttingagainst the web 9 of the holder. In this way the position of the pins inrelation to the grinding wheel can be regulated as desired.

A diamond q for dres ing the face of the grinding wheel is carried in a pivoted bridle 1 so that it can be turned out of the way when not required.

The manner of using our improved maof vtheblade is drawn across the revolvingstone o If it is desired that the tang shall havea square end, the blade is moved onto the pin 71. and placed so that the back of the blade bears against the stop 9'. By a similar movement of the holder 9 the end face m of the tang is trued up on the stone. The

blade is then placed on the third pin h? with its back bearing against the stop 10 and the face :0 of the. tangwground as beforedescribed. It will be understood that the wheel a ma be of any convenient configuration; in

Fig. 7 it is shown cup-shaped as'that is a section we have found, to answer our purposes Very well.

we claim and desire to secure Having now described our invention what by Letters Patent is 1. In a cutlery grinding machine for i finally shaping or squaring the tang ends of pen or pocket knife blades, work holder "fittings. comprising stepped bolts, each with a pin fixture; non-rotatable tapering pin' carrier, and securing means;

2. The combination with a cutlery grinding machine, of a work holder comprising an adjustable stepped bolt provided with a radially extending opening, a bracket removably secured in said opening, and a work-holding member removably secured insaid bracket, said member and bracket be WALTE VTYZVACKJ ALBERT WRIGHT.

HERBERT "SENIOR. i 

